On the Patreon feed, Jacque asks: I have a question about IPM and a regular sugar scrub, not emulsified. I am trying to make a cost effective sugar scrub but have it not too greasy and last about 1 year. My favorite is grapeseed oil but I know the shelf live is 3-6 months.  A few of the other oils I have tried are a little too greasy. Do I have to heat and hold for 20 minutes"  Will the IPM harden up"  How much should I use"  I've read most of your posts on this but I can't find one about sugar scrubs that aren't emulsified.  

I've written quite a bit about oil based scrubs - if you click on this link, you'll see links at the bottom for many more - but I tend to use salt instead of sugar, for some reason I can't really remember at the moment. I think it's because I tend to have loads of salt around but we don't use a lot of sugar. But then again, I use sugar in my emulsified scrubs, so I have that around the house all the time. Weird...
IPM or isopropyl myristate is a very liquidy ester, so liquid and clear you'd think it was water if it didn't have a label on it. (Don't drink it though. You'll be fine, but it tastes like a light oil would. A bit greasy and oily.) It's a great addition to anhydrous or non-water containing products to reduce the greasiness. It's also a great emollient and makes your skin feel nice after using it. It won't harden up as it's like any oil that stays liquid at room temperature. 
So the short answer ...